fix format (#332)

Co-authored-by: 何晓昕 <cautious@r-205-106-25-172.comp.nus.edu.sg>

colossalai/communication/utils.py

@@ -7,7 +7,7 @@ from colossalai.utils import get_current_device
 
 
 def send_tensor_meta(tensor, need_meta=True, next_rank=None):
-    """Sends tensor meta information before sending a specific tensor. 
+    """Sends tensor meta information before sending a specific tensor.
     Since the recipient must know the shape of the tensor in p2p communications,
     meta information of the tensor should be sent before communications. This function
     synchronizes with :func:`recv_tensor_meta`.
@@ -36,7 +36,7 @@ def send_tensor_meta(tensor, need_meta=True, next_rank=None):
 
 
 def recv_tensor_meta(tensor_shape, prev_rank=None):
-    """Recieves tensor meta information before recieving a specific tensor. 
+    """Recieves tensor meta information before recieving a specific tensor.
     Since the recipient must know the shape of the tensor in p2p communications,
     meta information of the tensor should be recieved before communications. This function
     synchronizes with :func:`send_tensor_meta`.
@@ -104,6 +104,6 @@ def gather_split_1d_tensor(tensor):
     gathered = torch.empty(numel_gathered, dtype=tensor.dtype,
                            device=torch.cuda.current_device(),
                            requires_grad=False)
-    chunks = [gathered[i*numel:(i+1)*numel] for i in range(world_size)]
+    chunks = [gathered[i * numel:(i + 1) * numel] for i in range(world_size)]
     dist.all_gather(chunks, tensor, group=gpc.get_group(ParallelMode.PARALLEL_1D))
     return gathered